What are some ideas for a secret santa?

the girl i have is 14 years old; shes very much into fashion and wears some pretty awesome outfits and always accessorizes so much! the price range is 15-20 dollars. shes a normal teenage girl and loves clothes and things like that. she also loves make up and plays a few sports.
what are some ideas for things i can get her?
$15-$20; no gift cards or cash allowed
thanks a bunch!

Well considering that she sounds a lot like me (except for the sports) I think she might like a nail polish set or other makeup sets, I love them at least.

Like these:
Essie nail polish gift sets, $17.00

http://www.ulta.com/ulta/browse/productDetail.jsp?productId=xlsImpprod1650233

http://www.ulta.com/ulta/browse/productDetail.jsp?productId=xlsImpprod1470062

sephora by OPI set (nail polish), $18.00

http://www.sephora.com/browse/product.jhtml?id=P249357&categoryId=B70

Korres Cherry Lip Kisses, $19.50

http://www.sephora.com/browse/product.jhtmlid=P244107&categoryId=C19970&shouldPaginate=true

Cargo Boggie Nights Kit (eyeliner set), $18.00

http://www.ulta.com/ulta/browse/productDetail.jsp?productId=xlsImpprod1650193

Sephora Brand Eyeliner, $20.00

http://www.sephora.com/browse/product.jhtmlid=P247240&categoryId=C19970&shouldPaginate=true

Pop Beauty set, $18.00

http://www.sephora.com/browse/product.jhtmlid=P211640&categoryId=C19970&shouldPaginate=true

hope I could help